GNU Radio 2.x: gr_check_lfsr_32k_s.h Source File

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# gr_check_lfsr_32k_s.h

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    00001 /* -*- c++ -*- */
    00002 /*
    00003  * Copyright 2004 Free Software Foundation, Inc.
    00004  *
    00005  * This file is part of GNU Radio
    00006  *
    00007  * GNU Radio is free software; you can redistribute it and/or modify
    00008  * it under the terms of the GNU General Public License as published by
    00009  * the Free Software Foundation; either version 2, or (at your option)
    00010  * any later version.
    00011  *
    00012  * GNU Radio is distributed in the hope that it will be useful,
    00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00015  * GNU General Public License for more details.
    00016  *
    00017  * You should have received a copy of the GNU General Public License
    00018  * along with GNU Radio; see the file COPYING.  If not, write to
    00019  * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    00020  * Boston, MA 02111-1307, USA.
    00021  */
    00022 #ifndef INCLUDED_GR_CHECK_LFSR_32K_S_H
    00023 #define INCLUDED_GR_CHECK_LFSR_32K_S_H
    00024
    00025 #include <gr_sync_block.h>
    00026 #include <gri_lfsr_32k.h>
    00027
    00028
    00029 class gr_check_lfsr_32k_s;
    00030 typedef boost::shared_ptr<gr_check_lfsr_32k_s> gr_check_lfsr_32k_s_sptr;
    00031
    00032 gr_check_lfsr_32k_s_sptr gr_make_check_lfsr_32k_s ();
    00033
    00041 class gr_check_lfsr_32k_s : public gr_sync_block
    00042 {
    00043   friend gr_check_lfsr_32k_s_sptr gr_make_check_lfsr_32k_s ();
    00044
    00045   enum state {
    00046     SEARCHING,          // searching for synchronization
    00047     MATCH0,
    00048     MATCH1,
    00049     MATCH2,
    00050     LOCKED              // is locked
    00051   };
    00052
    00053   state                 d_state;
    00054   unsigned int          d_history;              // bitmask of decisions
    00055
    00056   long                  d_total_errors;
    00057   long                  d_total_shorts;
    00058
    00059   static const int BUFSIZE = 2048;
    00060   int                   d_index;
    00061   unsigned short        d_buffer[BUFSIZE];
    00062
    00063
    00064   gr_check_lfsr_32k_s ();
    00065
    00066   void enter_SEARCHING ();
    00067   void enter_MATCH0 ();
    00068   void enter_MATCH1 ();
    00069   void enter_MATCH2 ();
    00070   void enter_LOCKED ();
    00071
    00072   void right (){
    00073     d_history = (d_history << 1) | 0x1;
    00074   }
    00075
    00076   void wrong (){
    00077     d_history = (d_history << 1) | 0x0;
    00078   }
    00079
    00080   bool right_three_times () { return (d_history & 0x7) == 0x7; }
    00081   bool wrong_three_times () { return (d_history & 0x7) == 0x0; }
    00082
    00083   void log_error (unsigned short expected, unsigned short actual);
    00084
    00085  public:
    00086
    00087   int work (int noutput_items,
    00088             gr_vector_const_void_star &input_items,
    00089             gr_vector_void_star &output_items);
    00090 };
    00091
    00092
    00093 #endif /* INCLUDED_GR_CHECK_LFSR_32K_S_H */